There is a 5.0 ?C charge at each of 3 corners of a square (each side 70. mm long). What is the force on +6.0 ?C placed at the center of the square?
What will be an ideal response?
110 Newtons toward the empty corner
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The potential energy of a spring is 0.3 J when it is compressed 0.04 m to the left of its equilibrium position. This is its leftmost position. What is its kinetic energy at this point?
A. 375 N/m B. -0.3 J C. zero D. 0.3 J
Light of wavelength 500 nm illuminates a soap film ( n = 1.33). What is the minimum thickness of film that will give an interference maximum when the light is incident normally on it?
A) 24 nm B) 94 nm C) 188 nm D) 279 nm E) 376 nm
A certain fuse "blows" if the current in it exceeds 1.0 A, at which instant the fuse melts with a current density of 620 A/cm2. What is the diameter of the wire in the fuse?
A) 0.45 mm B) 0.63 mm C) 0.68 mm D) 0.91 mm
The figure shows a ‘snapshot’ of four different waves in identical ropes stretched with the same force
The wave where the speed is greatest is
a.
I.
b.
II.
c.
III.
d.
IV.
e.
all of the above.